Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

gorann

Members
  • Content Count

    3,042
  • Joined

  • Last visited

  • Days Won

    6

Everything posted by gorann

  1. I will get back to these one less windy night when my 14" would not wobble so much (I need 0.3"/pix guiding and not the >1 that I had last night), and then maybe even get fairly close to Adam's resolution. With 3.5 m FL you really need tight guiding. Last night the "widefield" of my Esprit saved the night and not even Hubble can compete with that FOV.
  2. For some reason these lovely galaxies seem to be rarely imaged (at least when I search Astronbin). Here are data from last night. The night was very clear and SQM showed 21.5, but it was quite windy. Most of it was collected with my Esprit 150 with ASI071 on the Mesu 200 (33 x 10 min at gain 200) which took the gusty winds quite well. About 50% of the data in NGC4274 and NGC4278 are from my 14" Meade (with the Sony A7s) on the EQ8, which due to its size and enormous dew shield was fighting more with the winds. Totally 10.2 hours. There are so many galaxies in there that there should also be a plate solved annotated image for the major ones but that is for later unless some volunteer to do it. Time for dinner and to find new galaxies to point at tonight!
  3. So a dying galaxy. Very interesting even if it must be the least impressive galaxy around
  4. Thanks! Yes, the 14" images were reduced to the size of the Esprit image, but you can always zoom into the image. Here is what two of tha galaxies looked like with the 14":
  5. Three galaxies in Draco caugth during recent nights with two scopes. Esprit 150 with ASI071 (on Mesu 200) caught the starfield and a bit of the galaxy data (57 x 5 min at gain 200) and most of the data for the three main galaxies were caught with my 14" Meade and Sony A7s on EQ8 (233 x 3 min at ISO3200). So, a reflector - refractor mix with two colour CMOS cameras, and totally 16.4 hours. There are surprisingly few images of these galaxies - maybe becasue they are quite distant (=small).
  6. Excellent image Dave! I did image the same group with my Esprit 150 a year ago, and seeing your image make me think that I may have been a bit too promiscuous with the colours (https://www.astrobin.com/394768/K/). Similar level of resolution but then we have the same magificient scope. Glad to hear that you have a spell of clear skies - we need something positive these days! I will hopefully get 2-3 clear nights from Friday.
  7. Like you I prefer RGB or images with a plaette looking like RGB even with some NB added, and you clearly succeded! Great image!
  8. If you have a car battery you can allways hook it up to that until something more practical arrives. Just check that you get the polarity right. ZWO recommends a devise that can deliver 5 A since the camera may draw more than 3 A. A 2 A fuse will brun up very soon, as yours did. You can burn the camera with too high voltage but you cannot burn the camera with amperes - it will draw the amperes it needs. PS. I would stay out of cheap chargers ment for things like razors since they may deliver a rather dirty (i.e. fluctuating) voltage that is not good for electronics.
  9. Glad that you also see it - maybe the name could catch on
  10. Excellent image Dave! I like everything, including the framing.
  11. A very faint nebula from the Shapeless catalogue and possibly the last one I image this season - as it is time to focus everything on galaxies. In my 3.3 hours of RGB data it was nowhere to be seen, it only appeared after I added 3.3 hours of Ha. It has no name what I know but it reminds me of some kind of ugly monkfish about to swallow a blue star. The nebula can been seen near the top edge of Tom's @Tom OD mega mosaic of Cassiopeia. Data collected with my Esprits side by side on the Mesu. Esprit 150 with ASI071 caught 38 x 5 min of RGB (gain 200) while the Esprit 100 with ASI1600 caught 13 x 15 min of Ha (gain 139, Baader 3.5 nm). So totally 6.6 hours of photons collected before the northen obsy wall got in the way. Because I found it to be quite faint I also kept the image quite dark.
  12. These are two relatively small (i.e. distant) and rarely images galaxies in Draco towards which I pointed my 14" SCT f/10 (so 3550 mm FL) on Saturday night (sitting on the EQ8). I had the Sony A7s on ISO 3200. A nice clear night with SQM 21.45 and guiding was rather good, around 0.4"/pixel. 132 x 3 min, so totally 6.6 hours. Processed in PI & PS. Now clouds are back....
  13. Thanks Wim, I am happy you like my restrained processing.
  14. Thanks a lot Michael, much appreciated! Yes, I now try to go for less common objects - and I entertain myself finding them on various net resources during cloudy nights.
  15. Thanks Alan! Sony A7s is quite a different camera. I have been drewling about one since it came about five years ago, but it was too expensive. Now when Sony has produced a Mk II and MK III version, the original (with still the same chip) has become affordable on ebay (where I got mine). The chip is a low light chip with very big pixels, so only 12 Mpixel even if it is a full frame APS. It is aimed a evening and night photography and the electronics is in a league of its own. ISO6400 is nothing for it, max setting is over ISO 400 000 if I remeber it correct, but at that setting it is very noisy.
  16. Thanks Dave! I think you are slightly wrong about their location - these ones are in Leo. You may be thinking about some other peculiar galaxies.
  17. NGC 3227 is an intermediate spiral galaxy that is interacting with the dwarf elliptical galaxy NGC 3226. The two galaxies are one of several examples of a spiral with a dwarf elliptical companion that are listed in the Atlas of Peculiar Galaxies, these as Arp 94. The data was collected over two recent nights and is a mix of 2 and 3 min exposures at ISO 3200 and 6400 as I am still testing out using the full spectrum modded Sony A7s on the 14" SCT (Meade LX200R). Air temperature was a few centigrees below zero which probably helped keeping noise down. This full frame 12 MP APS camera have large 8.32 µm pixels, so it is a relatively good match (still a bit oversampling) for the 3.55 m focal length of the SCT. This 40 kg scope is sitting on my EQ8 which handles it quite well. OAG with Lodestar X2 and guiding around 0.4 "/pixel which is almost sufficient (my pixel scale is 0.49"/pixel so it would be nice with guiding below 0.3"/pixel and the EQ8 can probably do it but the sky is rarely that steady). SQM was good, around 21.3, which helps when hunting relatively distant galaxies. Totally 8.9 hours of data. Cheers Göran
  18. We have had a spell of clear nights here and these days I have plenty of time for imaging. So I have been both hunting galaxies and continued collecting interesting objects in the Sharpless catalogue. Here are two of them in the constellation of Camelopardalis, the bigger one in the centre is Sh2-207 and the smaller one to the left is Sh2-208. The small star cluster seen in Sh2-207 is Mayer 2. The big area of nebulosity covering the left side of the image has as far as I know no number or name, possibly becasue it is very faint. Still it has some nice structures. Almost all the red signal was picked up by the Ha filter and there is only a faint indication of Sh2-207 in the RGB data. Sh2-207 was once thought to be a planetary nebula, given the designation PK 151+02 1, but this is probably not the case. These nebulae are 13 000 - 15 000 ly away Ha was collected over two clear nights (SQM 21.3) with the Esprit 100 and ASI1600 (40 x 15 min at gain 139, Baader 3.5 nm Ha filter) and RGB with the Esprit 150 and ASI071 (125 x 5 min, gain 200), sitting side by side on the Mesu 200. Totally 20.4 hours which is longer than I usually image, but this are is quite faint.
  19. Aha! I see, did not know they were called craws feets in the UK! We call them laughter wrinkels here. I still live and l still learn. Thanks Dave!
  20. Thanks a lot Tom! Yes I was surprised that there was so much detail in this nebula - most images I have seen have been very fuzzy. Does "the crows feet" refer to the cluster NGC103 in the bottom right corner?
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.